Being as those hills are lower than 1500' or so for the most part, elevation will not kill the OP that much if at all in reality.
Only real issue I see, is how much payload the truck may or may not have. That will be the biggest issue I see. It will be slower on the 4-6% grades than many like, but it should get up the hill, fetch a pail of water and make it down in one piece. Chassis size is not first choice with a family. I had a SW 9200 gvwr 35 series at gvwr with over 2600 lbs of payload. A 26' fleetwood 24C trailer, usually around 6500 on axels, and 650-750 of hw.
Marty
